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UNITED STATES vPATENT OFFICE.

FRED W. OOOLEY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF TWO- THIRDS TO GEORGE T. HONSTAIN, OF MINNEAPOLIS, MINNESOTA.

DumPlNe-PLATFORM.

To @ZZ whom t may concern.'

Be it known that I, FRED W. CooLnY, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Dumping- Platforms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to dumping-platforms such as used in connection with grainelevators and elsewhere for unloading grain from wagons, and has for its object to improve such devices in the several particulars hereinafter noted.

The invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure l is a vertical section taken longitudinally through the improved platform and coperating parts on the line x of Fig. 2. Fig. 2 is a transverse vertical section taken on the line x2 :1:2 of Fig. l. Fig. 3 is a horizontalsection taken on the line m3 ac3 of Fig. 2, tion taken on the line x4 004 of Fig. 2.

As is well known, these so-called dumping-platforms are usually applied to the platform of a platform-scale and are usually made up of a pair of heavy parallel beams that are pivotally connected at their intermediatel portions to the scale -platform. Also the said scale -platform is usually mounted approximately on the same level with a fixed platform or driveway, and by tilting movements of the so-called dumping-platform the load of grain or other material on a wagon may be dumped into a pit located below the said platform.

My invention relates particularly to means for operating the so-called dumping-platform or pivoted beams which constitute the same.

Referring now in detail to the construction illustrated, the numeral 1 indicates the fixed platform or driveway below which the pit is located.

The numeral 2 indicates the scale-platform, which may be supported in the usual or any Specification of Letters Patent.

Application filed September l, 1906. Serial It o. 332.976.

and Fig. 4 is a vertical sec-y Patented Jan. 1, 1907.

suitable way by means of a scale mechanism, and hence is of course capable of limited upward and downward movements as required in the weighing action, but is always held in a horizontal position. The beams which make up the so-called dumping-platform are indicated by the numeral 3, and these are loosely mounted in parallel longitudinallyextended seats formed in the said scale-platform. The said beams 3 at their intermediate portions are pivotally connected to the adjacent beams of the scale-platform 2 by heavy pivot-bolts 4. The scale-platform 2 is shown as provided with a transverse bar 5, that limits the downward movements of the forward ends of the platform-beams 3, the said beams being capable of pivotal movements, as indicated by dotted lines in Fig. l.

The numeral 6 indicates a hinged door which when raised affords an opening through which the material from the wagon located on the beams 3 may be dumped into the pit below the platform.

Extending transversely below the scaleplatform 2 slightly at the rear of the forward ends of the platform-beams 3 is an oscillatory support 7, shown in the form of a heavy plank. This plank 7 is supported entirely from the central platform and is connected thereto with freedom for oscillatory movements transversely of its length and longitudinally of the pivoted platform-beams 3 by several pairs of pivotally-interlocked eyebolts 8 9, the former of which are rigidly secured to thev said plank oroscillating support 7 and the latter of which are rigidly secured to the longitudinal beams of the said scale platform 2.

Bolted or otherwise rigidly secured to the under surface of the plank 7 is a pair of boxlike bearing-brackets l() and Il, in each of which is rotatively mounted a nut member,

shown as in the form of a sprocket l2. Vorking with threaded engagement through each sprocket or nut member l2 is a long and heavy screw-bolt 13, which, as shown and preferred, is provided with square threads. The said screw-bolts 13 work freely through perforations in the plank 7, and at their upper ends they are pivotally connected one to each of the platform-beams 3, as shown at 14. These pivotal connections 14 are preferably quite close to the forward ends of the said platform-beams 3, as clearly shown in Fig. l.

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As is evident, by simultaneous rotations of` the two sprockets or nut members 12 the two platform-beams 3 may be given like tilting' movements either upward or downward. For imparting these simultaneous rotary movements to the brackets or nutmembers 12 I preferably provide a sprocket-and-chain drive which includes a driving-sprocket 15, an idle sprocket 16, and a sprocket-chain 17. The idle sprocket 16 is journaled in the bearing-bracket 10, and the driving-sprocket 15 is secured to the lower end of an upright operating rod 18, which rod is rotatively mounted in one end ot the plank 7 and in a bearing-bracket 19, secured. to said plank. At its upper end the operating-rod 18 is shown as provided with a hand-wheel 20, by means of which it may bc easily rotated, and just above the bracket 19 it is provided with a collar 21, that holds the same against endwise downward movement. The sprocket 17 runs over the driving-sprocket 15 and over the sprockets 12 and 16, as best shown in Fig. 3. The said operating-rod 18 works freely through a slot 22 in the fixed platform 1.

As is evident, by tui-nino' the operating-rod 18 in the proper direction the sprockets or nut members 12 may be simultaneously rotated in a direction to cause the screw-bolts 18 to move upward and thereby tilt the platform-beams 3 into dumping position. (Shown by dotted lines in Fig. 1.) It will be noted that when the said screw-rods are moved upward, as liust noted, they assume angular positions wi th respect to vertical lines, and hence cause the oscillating' support to wit, the plank 7-to oscillate or move out of a horizontal position, such oscillatory movements being permitted by the hinge-like connections ail'orded by the I-bolts 9. lt will also be noted by reference particularly to Fig. 4 that the operating-rod 18 is then moved out of a true vertical position, inasmuch as it is carried by said oscillatory support 7. The groove 22 in the platform 1 permits the Afree oscillatory movement olf-said operating-rod 18. t

By mounting the screw-rod-operating devices upon the oscillatory support or plank 7 very simple operating mechanism is made possible, and, furthermore, there is provided an operating device which works under a -minimum of friction. The elements in the said rod-operating device, it will be noted, always maintain predetermined relative positions with respect to each other. Furthermore, the mechanism described is simple and of small cost.

What I claim is- 1. rfhe combination with a dumping-platform, of means for imparting pivotal movements thereto, comprising an oscillatory support, a screw-rod connected to said dumpingplatform at one end, a nut member swiveled on and. carried by said oscillatory support and working on the said screw-rod, and means for transmitting rotary motion to said nut member from a 'distant point, substantially as described.

2. The combination with a dumping-platform comprising a pair of pivoted beams, of an oscillatory support mounted below one end el' said dumping-platform, a pair of screw-rods attached at their upper ends to said dumping-platform, a pair of nut members swiveled on and carried by said oscillatory support and working on each of said screw-rods, and power-transmission mechanism extending' from a distant point to the said two nut members and operative to simultaneously rotate the same, substantially as described.

8. The combination with a scale-platform, of a dumping-platform applied thereto and comprising` a pair of pivoted beams, a transverse support connected to one end portion of said scale-platform and supported thereby :for oscillatory movements, a pair of screwrods attached at their upper ends to said dumping-platform and depending` through said transverse oscillatory support, a pair of nut members swiveled on said oscillatory support and working one on each of said screwrods, of an upright operating-rod mounted in bearings carried by said oscillatory support, and connections between Asaid operating-rod and the said nut members for simultaneously rotatingthe latter, substantially as described.

4t. The combination with a fixed platform 1 and scale-platform 2, of a dumping-platform. comprising a pair of 'beams 3 ivotally connected to said scale-platform, o a plank or support 7 extending transversely below one end portion of said scaleplatform, interlocked eyebolts 9 loosely suspending said plank or support 7 from said scale-platform, screw-rods 13 pivotally connected to said platform beams 8 and working loosely IOO through said plank or support 7, sprocket- FRED W. COOLEY.

Witnesses MALIE HOEL, F. D. MERCHANT.

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